on some ancient metallic Arms and Utensils. 409 
On cooling, it was found that the figure of the metals which 
had not been melted in the coppels was not altered, but they 
were changed, either totally or externally, into scoria-like black 
matter. The copper allayed with zinc was found to contain a 
nucleus of copper within a large proportion of black scoria and 
white oxide of zinc. The celt metals were changed into scoriae, 
including copper-like metal. The other old metals were changed 
entirely into scoriae. The copper allayed with one-twentieth of 
its weight of tin was changed into scoria containing a little 
copper; but the copper allayed with one-eighth of tin was 
changed into scoria containing a little copper, seemingly al- 
layed with a much smaller proportion of tin than before. 
The pyrometer pieces indicated degrees of fire, which varied 
between 18 0 and 21 9 . The pyrometer piece in the coppel which 
contained the silver, and also that in the coppel which contained 
the copper, denoted 20° of Wedgwood's scale, or about 3800* 
of Fahrenheit's scale. 
( c ) A thin plate of each of the old metals being exposed to 
the flame of a candle with the blow T -pipe, a blue and green 
flame appeared, which soon disappeared, although the fire of 
the candle was applied so as to keep the metal red hot. 
The same kind of blue and green flame was emitted from 
plates of these metals when they were exposed to fire in open 
crucibles, before they were melted ; but it disappeared in a few 
seconds of time, although the fire was continued to be applied 
to keep the metal red hot ; nor was any such flame produced 
when the metal was melted in open vessels, or kept stirring 
when in a fluid state. 
( d ) Each of the ancient metals being melted in close ves- 
sels, was then exposed to the air, and stirred with an iron rod ; 
3 G 2 
